As soon as I have shot my single, I then concentrate on my doubles. Once doubles are shot, concentrate on the sim pairs! Always watch the person shooting to the right of you as said above as that is what you will be shooting on the next stand.
It’s easy to get flustered so maybe before you shoot tell the ref you are new to it, most refs I know will give you a bit of slack. Don’t be frightened to ask if in doubt and make sure you have enough cartridges in your pouch or Skeet vest. It’s 25 targets but you can double barrel the singles so in effect need at least 30 cartridges and if you have to go back to your bag half way round you break your concentration. On the sim pairs if they both look fast/hard go for the one you think you can hit first, 50% is better then nothing!,
Most of all enjoy it, if you shoot it badly first time, don’t give up, it can be addictive and certain grounds put on harder targets then others.
Good luck!